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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c991e8e2833824251b75615639220f8f32af5180e29aa06448ca3201ec1611fe' 
  AND token = '7o12fXFD+fLeOeOARqOhkltOK1M0cullyBYyYPsczV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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