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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c1ee4c280463ffd0c4311759904f08262cd23117a83f3ff1b88066175acc9d' 
  AND token = 'IAPE9hfJL4vjWl+L9LAEDsTAFQ0Wp/bm6rPxsqTrLZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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