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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cbfd6af0812261f34fc21e32720975f8a18e672eb01c5085f459d32fcca48c' 
  AND token = 'YNysLG5ByiIVjr88qv1If/3Xhoum1NW8uQVL0aBWxmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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