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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea71580c9def401b1cc838d373c2aa683f826ac3610c37e7447227dfa7c0cd2' 
  AND token = 'RNf1t8kdQNTtfT+G6xep4pMyowGLmaImIQFBEHd8yeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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