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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293718e8c0da82c473a0395902fcf303cd435944abf6f0469bb57b8b5d9e9d60' 
  AND token = 'AhI6bsufQ/NahjocnHkF7Q30kykVt1+ASfPKHExgSKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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