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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18364d6a31d96def97111169f27144100582239f3b977c34202a96c532b5b09' 
  AND token = 'kivq3lNT1fCSxrrXHr9D+mbupQKen4aK2EZ5VU1lpUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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