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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d126b3e1f1383247c103e2d576ef92deceb6ecf14a7c702c131e42bcadc6af' 
  AND token = 'ENEXoLLJziWHw5WCy83gns4CY7jUnxrk3R3NHvREPeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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