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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf31651cc3a57dc2d90858db735120eba59ae1b68ea6465ab19d3bef59fb5811' 
  AND token = 'xSjC+kpl4Jad+xurvmISQF6s4yRfOCJ8fKXJb+ZpEUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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