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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e361e1109dcd3f781e173f4a758bf796ceed58b59babe5727c46c3df8ce9e0' 
  AND token = 'O/Atk2FlLdjT8ciqNwHiGwm/z4dWLExoF2hrE8Lw1RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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