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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b854757d91f0a8551b0706dae0cebd7d432c48503c9fab4ba32a211793e5f7a5' 
  AND token = 'MBTO+oYxyK0wZpEsd87k7JGog9E8BGTCP0iFdhc52ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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