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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db010b28e7e42d9ed867952784b7941db3382869c4707eacb13b0a176e30c1fc' 
  AND token = '14aK92GXOgow/B2sGrLE+kYMlWyOAwIX9uESErTyy9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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