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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e902381e81f9583b126da2a0c86fbd9034031e829b208086e84b89069d5531' 
  AND token = '2VRRLStPH2z19c3e6Mbx0Z/PQkFCEY+4EC0b6Amkc+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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