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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbda751e4c5de83ef3b0177e605894ac479585103ce2dba1ac6f5dcafa6eb8a4' 
  AND token = 'e+pL3e4nXlKWM58XBdbPsl2OKxExF1Lsesvc797G3MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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