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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbd49e67a392197832bb870ccdd1e5b2b584a757fe8e32caa0987ff9fc9bc7d' 
  AND token = 'RDXSW5eiKccJ8c6XMVyEUyPGD8APuwNaFqPI79o/Q9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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