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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e0f5d256499331644170639d4e67d94dd7c1baf8c129ffe2a4118431a39ad9' 
  AND token = '0+Jc8Vn2sahc1ERKttCYv/MkTkxlbiOofjCX8DNzcus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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