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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d5038ec2c3cca7d52e52f724b4db9dcf7cdd75040577070d2377b7412250f2' 
  AND token = '3QAFt5a2f7p3e5EoNloL/mptgl6Y0H9yVmiWrH7MFXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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