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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542dfbbc7ff79fb3104b3197d95be58835436cf2b6d2823c3d42ac461765c4dc' 
  AND token = 'qOucXoiHP/34oxvabOR7zf1nM7oiMi1HLf4FjgcrBIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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