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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837d206ce7039f89ad9d7766285e83cec4e14237086a44038e3921fbce047a1c' 
  AND token = 'vo0OQekJRUCqE+dcrNGjT+gDtIrlKjBOCBYcW424pgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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