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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c768d1e945f8b35823889af53a64d76cefc00b3b2f0ccc9e2f1099ababf98c' 
  AND token = 'uetIK6EdtqhKQ7/0ACoiIyibnqntBjzzHRTGLMSe2nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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