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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c13894415ae28e7196c663b574cb3fc11e3683e42d082eaa970c5c02dbb9b1' 
  AND token = 'oCS/RGTEhxYV495hBS5ntez98nVOlaXI5UbOY2WQEYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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