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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3caab32a28c541b51c9ddcd65d605bc4a0528b7c8c43a07ee297b1291a5e27ba' 
  AND token = 'oh/x+Pd9ezP+8kI5Bb0oacS+2ybDgVShENgDF+Gj1Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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