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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14a8d8c97f1bc77d640353e7ea247e5fbec44d8bfe176bdb0664141f6e7e137' 
  AND token = 'hW8S9kAcNSPe/ihUi0WKaachsn9afoRp8iG+LHSBmWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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