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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede28252af3ca120d35df7d9d86ca29c979c1e61d988b000060316b4d85925d7' 
  AND token = 'vvypSqyo5M0xQPRdxo4N/Y9lQ6Ob+Gr8HShc4GgNRbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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