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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7196fbbe1c007c791a29203b184e47af5e4f1c59098a0ae6691c943d585344' 
  AND token = 'M4krb1M4MMnz+uQOGLSA5KpWkHHWhnhpYqZMkOcrBWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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