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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81ae62337f7bb6c7f27e92c69daaed825b0b90596f50922fb0889e365ca414d' 
  AND token = 'SBACKula2ecNhGuh9f0Lww3cQC7aGVNubUBXymiCF5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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