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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9720d634cfd4886f64ccf40c0ce08fb74d5096cf916ef9e3139a9cb059707bb0' 
  AND token = 'KCcBvAmOEvPQhqBEQEu5F3Vc8rb+pKMARAW0OLU32Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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