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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f444f40b512d9617223be84d5ca08a2f94e313e2d8185331df6984bd920767' 
  AND token = 'MB+n3Hu3lyvSiQ3jO4w08qKrs8FEBZjTC2fa+T9fz+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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