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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd920a9c23fdc85d544bb821a374dfb07d7d5e83a33f34e93b462390f4c1adf74' 
  AND token = 'TXKASituPBJEeQe47/rj3ARf2mrRJoB/wjRm05sPInk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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