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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9422e63efcb1e75cb0513ad8d29e5952417bac5e2c11ad80b3b154c4838044' 
  AND token = 'iBlaXAf+F34MfxiJwiwloctOCJlUc2Wwq0mgCtVch+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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