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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ac77ac82f490ffc970b8fa5177f8ad781f3bf820bf55edc116991652e63cf1' 
  AND token = 'pfRoPX/gvrRj6j+0n7vu17cuHavskSBjke55y48Hpm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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