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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc084847ea5778b4a98fb3678d9105406c39914a42708024aaaaeeed3d6c42f' 
  AND token = '1bsC7oufSyw0iiwoU39WVqRisofLuEQvJ0mx/Eqm3kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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