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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f037ddd6819f62e8a018df4df39df04370102cd723e8d8276b6f72e2c6e46a' 
  AND token = 'hAix/hk75Ehw85O1tiNVi9tDcFgNOabKNf+L0b2z3FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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