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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87229345acd5df361d8173cc0940df44ff621e899cc6c751e599b3fca808c039' 
  AND token = 'Whn/ivBTrD93y1VDyWgrZ4umfasiHQO6e18O1jnTc1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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