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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2adff1d01d40d55fbd1d3c6fe057bc79ca37f1eb6625eea35e07f3f3fa07fecf' 
  AND token = 'fxhJHFmf4WNTbzQxLkawhs9heZu/rKa8DpfLGGhLD28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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