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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2117b1e40e863e2c6bd982bf76374619dc2abd4c38becf9223e5ca14148bcd' 
  AND token = 'Pwd3t1PJo3v0n9GqsEPErdbiK42hm66l6voFqpu2TGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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