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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735bb4ef230c865972c74c380e0e22f089c4072140810db588c47b50e4268d86' 
  AND token = 'e6gujiIzFVaGFGYG/5et5i+I3t36MXiVlvvXl8Y1GJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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