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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3daae836c90320b575cd2eb95c9d69bbfc2db4d784d963f3d6504d5d99b691b' 
  AND token = 'ALNVpuFTywDh6G5639nO1DAsJb2Qd4O15tFbsW6CM8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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