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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72b43f3cd5d137881e194ea66d0372ad549bdac40af3450759a229d98554afa' 
  AND token = '92ezUCgy8i1c09iV1qc+F+DYxGq6S7HDe/rpxrVSgNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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