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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244a91c605e1c8e20447fac8e24a90122298f98b71db849121f1abc72fd6deb5' 
  AND token = 'EAeTa+01cC1Im8riEC8Rz6qvUn8jBPVQvicENiimKBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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