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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396c2764c1ed3c6f92fe38c8ed6bde21df1c0016ecfcc4ab3c86efc542315c9e' 
  AND token = 'FPT4osyCCRJCI1tButUtZVLoxx1bBmL/PkbmcLHw0wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}