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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2976d29fd67f7fc09b1ca04b47e1553b35148c2e80203f83f8d1ab5e3e0ed94' 
  AND token = 'OnYM+Ba6BHHcMco3gJLKOxfVjVVbk0JdkbUEXfzfrWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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