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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6429be32aa6a331e5cf7bec1ff143aaac9bfdbb36d058d2a3c7389a3719ed481' 
  AND token = 'N230MNP5Z7iwyAdL4DfJ4HsvJvlBYFAYHgZNTdPMmps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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